15819442840 has 16 divisors (see below), whose sum is σ = 35593746480. Its totient is φ = 6327777120.

The previous prime is 15819442831. The next prime is 15819442843. The reversal of 15819442840 is 4824491851.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15819442843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197742996 + ... + 197743075.

It is an arithmetic number, because the mean of its divisors is an integer number (2224609155).

Almost surely, 2^15819442840 is an apocalyptic number.

15819442840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15819442840 is an abundant number, since it is smaller than the sum of its proper divisors (19774303640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15819442840 is a wasteful number, since it uses less digits than its factorization.

15819442840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395486082 (or 395486078 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 46.

The spelling of 15819442840 in words is "fifteen billion, eight hundred nineteen million, four hundred forty-two thousand, eight hundred forty".